hive常用函数

1.LATERAL VIEW

2.explode

3.

4.count(distinct ) 速度慢

https://sjq597.github.io/2016/04/24/Hive-group-by-distinct%E6%80%A7%E8%83%BD%E8%B0%83%E4%BC%98/

http://www.jasongj.com/2015/03/15/count_distinct/